CN119319036A

CN119319036A - Dry Magnetic Separator

Info

Publication number: CN119319036A
Application number: CN202411334878.9A
Authority: CN
Inventors: 谢盺; 龙春明; 任冰
Original assignee: Xinjiang Zhundong Economic And Technological Development Zone Berry Bo Technology Environmental Protection Co ltd
Current assignee: Xinjiang Zhundong Economic And Technological Development Zone Berry Bo Technology Environmental Protection Co ltd
Priority date: 2024-09-24
Filing date: 2024-09-24
Publication date: 2025-01-17

Abstract

The present invention provides a dry magnetic separator, which solves the phenomenon of material aggregation and clumping caused by electrostatic adsorption and magnetic agglomeration of fine powder, including: a casing; a vibrating feed trough, which is arranged at the inner upper part of the casing; a magnetic drum, which is rotatably arranged inside the casing; a vibrating screen, the top of which is hung on the casing, and the vibrating screen is located at the outer periphery of the magnetic drum, a driving member is fixed on the casing, connected to the vibrating screen, and the driving member is used to drive the vibrating screen to reciprocate along the axial direction of the magnetic drum; a plurality of gap adjustment balls, the balls are installed on the side of the vibrating screen facing the magnetic drum, and the gap adjustment balls are in rolling contact with the magnetic drum, so that a gap is maintained between the inner curved surface of the vibrating screen and the magnetic drum. In the present invention, when the material falls into the vibrating screen, it is horizontally pushed and stirred at a high frequency by the dense vertical screen bars of the vibrating screen, and during the downward movement of the surface of the magnetic drum, it reciprocates multiple times along the axial direction of the magnetic drum, and the whole is in a boiling state, which completely eliminates the aggregation and clumping phenomenon of fine powder.

Description

Dry magnetic separator

Technical Field

The invention relates to the technical field of magnetic material sorting equipment, and is particularly suitable for a dry magnetic separator.

Background

Along with the rapid development of the coal-electricity industry, a great amount of iron resources are contained in the fly ash, most of the fly ash is abandoned after being mixed in cement mixture, and a small amount of fly ash is directly buried, so that huge resource waste is caused. In order to separate iron resources in the fly ash, a dry magnetic separator special for the fly ash is produced.

The magnetic separator is divided into a wet magnetic separator and a dry magnetic separator, the wet magnetic separator has very mature technology and good magnetic particle separation effect. However, in remote mountain areas with inconvenient traffic and drought and water shortage, a wet magnetic separator cannot be used, the amount of fly ash discharged annually by a national thermal power plant is very large, the total iron content is generally low, the economic benefit of wet magnetic separation is low due to the limitation of water conditions and operation cost, and in such cases, the iron selection mission can only fall onto the dry magnetic separator.

The dry magnetic separator in the prior art has good magnetic particle sorting effect on materials with granularity of more than 20 meshes, mature technology and wide application, but has poor magnetic sorting effect on the fine powder materials because of the phenomena of electrostatic adsorption and magnetic agglomeration of the fine powder dry materials with granularity of less than 20 meshes.

Therefore, how to provide a dry magnetic separator suitable for materials with granularity below 20 meshes is a technical problem that needs to be solved by the person skilled in the art.

Disclosure of Invention

The invention provides a dry magnetic separator, which aims at solving the problem that dry materials with granularity below 20 meshes are difficult to separate in the magnetic separation process in the prior art, and magnetic particles are separated from the materials by adopting a measure for eliminating the aggregation and agglomeration phenomenon of fine powder, so that the enrichment of iron-containing particles is realized, and the industrial utilization standard is achieved.

The invention provides a dry magnetic separator, comprising:

The top of the shell is provided with a feed inlet;

The vibration feeding groove is arranged in the shell, and the top of the vibration feeding groove is arranged corresponding to the feeding hole;

The magnetic roller is rotationally arranged in the shell, a part of magnetic field is arranged in the magnetic roller, and the position of the region of the magnetic field relative to the shell is always kept unchanged;

The top of the vibrating screen is hung on the shell, the vibrating screen is positioned on the periphery of one side of the magnetic drum, which is provided with a magnetic field, and the top side of the vibrating screen is correspondingly arranged with the bottom side of the vibrating feeding groove;

The driving piece is connected with the vibrating screen and is used for driving the vibrating screen to reciprocate along the axial direction of the magnetic roller;

the gap adjusting balls are arranged on one side, facing the magnetic roller, of the vibrating screen, and the gap adjusting balls are in rolling contact with the magnetic roller so that gaps are kept between the inner curved surface of the vibrating screen and the magnetic roller.

The dry magnetic separator provided by the invention further comprises an electrostatic grounding device, wherein the electrostatic grounding device is used for introducing electrostatic charges in fine powder adsorbed on the surface of the magnetic roller to the ground.

According to the dry magnetic separator provided by the invention, the electrostatic grounding device comprises:

one side of the carbon brush is connected with the magnetic roller, and the other side of the carbon brush is connected with the shell;

And the grounding wire is connected with the shell in a welding way.

According to the dry magnetic separator provided by the invention, the vibrating screen is connected with the driving piece through the crankshaft.

According to the dry magnetic separator provided by the invention, the dry magnetic separator further comprises a connecting piece, one end of the connecting piece is connected with the shell, and the other end of the connecting piece is fixedly connected with the top of the vibrating screen through screws.

According to the dry magnetic separator provided by the invention, the vibration amplitude of the vibrating screen is 0.6cm-2cm, and the gap between the vibrating screen and the magnetic roller is 1+/-0.1 mm.

According to the dry magnetic separator provided by the invention, the driving piece comprises the exciting motor, and the vibration frequency of the exciting motor is 1000 times/min.

According to the dry magnetic separator provided by the invention, the clearance adjusting balls are uniformly distributed on the inner side of the vibrating screen.

According to the dry magnetic separator provided by the invention, the dry magnetic separator further comprises a permanent magnet, wherein the permanent magnet is used for generating a magnetic field for the magnetic roller, the vibrating screen covers half of the surface area of the magnetic roller, and the vibrating screen is arranged corresponding to the permanent magnet.

According to the dry magnetic separator provided by the invention, the dry magnetic separator further comprises:

the material dividing plate is arranged at the bottom side of the vibrating screen;

the product hopper is arranged at one side of the material separating plate, which is far away from the vibrating screen, and is used for receiving products;

And the tail hopper is arranged on one side of the material distributing plate, which is close to the vibrating screen, and is used for receiving waste materials.

According to the dry magnetic separator provided by the invention, the feeding hole is formed in the top of the machine shell, the vibration feeding groove is formed in the machine shell, the top of the vibration feeding groove is correspondingly arranged with the feeding hole, the magnetic roller is rotatably arranged in the machine shell, a part of magnetic field is arranged in the magnetic roller, the magnetic field area is always kept unchanged relative to the machine shell, the top of the vibration screen is hung on the machine shell, the vibration screen is positioned on the periphery of one side of the magnetic roller, which is provided with the magnetic field, the top side of the vibration screen is correspondingly arranged with the bottom side of the vibration feeding groove, the driving piece drives the vibration to reciprocate along the axial direction of the magnetic roller, the gap adjusting balls are arranged on one side of the vibration screen, which faces the magnetic roller, and are in rolling contact with the magnetic roller, so that gaps are kept between the inner curved surface of the vibration screen and the magnetic roller, the material falls in the vibration screen, and the vertical screen strips densely distributed by the vibration screen are transversely pushed and stirred at high frequency, and the mechanical force applied to the material is far greater than the resultant force of electrostatic adsorption force and magnetic aggregation force between the material particles, so that the material can reciprocate repeatedly along the axial direction of the magnetic roller in the surface movement process, and the whole is in a boiling state, and the fine powder aggregation phenomenon is thoroughly eliminated. And when the magnetic particles roll up and down, the magnetic particles are attracted by the magnetic force in the magnetic drum to continuously move towards the surface of the magnetic drum, the occupation of the non-magnetic or weak magnetic particles is extruded, the more the magnetic particles are formed on the surface of the magnetic drum, and finally the magnetic particles fall into a product hopper in a discharging area. The nonmagnetic and weakly magnetic particles are forced to move outwards and fall into the tail hopper under the action of gravity, so that the aim of high-efficiency magnetic separation is successfully achieved.

Drawings

In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a block diagram of a dry magnetic separator provided by the invention.

Fig. 2 is an axial view of the dry magnetic separator provided by the invention.

Reference numerals:

1. A housing; 2, a feed inlet, 3, a vibration feed trough, 4, a magnetic roller, 5, a vibration screen, 6, a driving piece, 7, clearance adjusting balls, 8, a connecting piece, 9, a permanent magnet, 10, a material separating plate, 11, a product hopper, 12 and a tail hopper.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1 and 2, the embodiment of the invention discloses a dry magnetic separator, which comprises a casing 1, a vibration feeding groove 3, a magnetic roller 4, a vibrating screen 5, a driving piece 6 and a plurality of clearance adjusting balls 7.

Wherein, casing 1 is as whole frame, and feed inlet 2 has been seted up at its top for the material that will select is introduced into inside the equipment. The vibration feed groove 3 is arranged in the shell 1, the top of the vibration feed groove 3 is correspondingly arranged with the feed inlet 2, the materials are ensured to smoothly enter and uniformly distributed on the vibration feed groove 3, and the materials are gradually conveyed to the surface of the lower magnetic roller along with slight vibration of the vibration feed groove 3.

The magnetic roller 4 is rotatably arranged in the shell 1, a part of magnetic field is arranged in the magnetic roller 4, the position of the magnetic field area is kept unchanged relative to the shell 1 all the time, when the magnetic roller 4 rotates, materials are fed into the magnetic field area, and magnetic particles are adsorbed to the surface of the magnetic roller 4 under the action of the magnetic field. As the magnetic drum 4 continues to rotate, the attracted magnetic particles gradually move to the other side where there is no magnetic field as the surface of the magnetic drum 4 moves. During this process, the magnetic particles are gradually separated from the non-magnetic particles. The separated magnetic particles are collected at the position of the magnetic drum 4 far away from the magnetic field area, and the non-magnetic particles vertically fall into the tail stock bin under the action of gravity and centrifugal force, so that the two magnetic particles are effectively separated.

The vibrating screen 5 top articulates on casing 1, and vibrating screen 5 is located the periphery of magnetic drum 4, ensures that vibrating screen 5 can work around magnetic drum 4, separates the material. The top side of the vibrating screen 5 is arranged corresponding to the bottom side of the vibrating feed trough 3, that is, the upper edge of the vibrating screen 5 is arranged at the lower edge of the vibrating feed trough 3, so that the materials falling from the vibrating feed trough 3 can directly fall on the vibrating screen 5 for subsequent sorting.

The curvature of the vibrating screen 5 is consistent with that of the magnetic roller 4, so that the gap between the two is easier to adjust.

The driving piece 6 is connected with the vibrating screen 5, and the driving piece 6 is used for driving the vibrating screen 5 to reciprocate along the axial direction of the magnetic roller 4, so that the material can be continuously vibrated and impacted by the screen bars on the vibrating screen 5, and the aggregation and agglomeration phenomenon of fine powder is eliminated. During the vertical rolling of the magnetic particles, the magnetic force in the magnetic receiving roller 4 continuously moves towards the surface of the magnetic roller 4, the occupation of the non-magnetic or weak magnetic particles is extruded, the more the magnetic particles are formed on the surface of the magnetic roller 4, the non-magnetic and weak magnetic particles are forced to move outwards, and fall into the tail hopper 12 under the action of gravity, so that the enrichment of the magnetic particles is realized.

The plurality of gap adjusting balls 7 are arranged on one side of the vibrating screen 5 facing the magnetic roller 4, and the gap adjusting balls 7 are in rolling contact with the magnetic roller 4, so that a fixed gap is kept between the inner curved surface of the vibrating screen 5 and the magnetic roller 4, and abrasion or faults caused by direct contact of the vibrating screen 5 and the magnetic roller 4 are prevented. Due to the rolling characteristic of the clearance adjusting ball 7, the clearance adjusting ball 7 is in point contact with the magnetic roller 4 and in rolling friction, so that the vibration screen 5 and the magnetic roller 4 are prevented from being worn in direct contact, the optimal distance between the vibration screen 5 and the magnetic roller 4 can be ensured, and the vibration screen 5 can play the maximum role of stirring materials in horizontal movement.

It can be understood that the relative positions of the clearance adjusting balls 7 and the vibrating screen 5 can be adjusted, so that the effect of adjusting the clearance between the vibrating screen 5 and the magnetic roller 4 can be realized. For example, the balls may be connected to the inner side of the vibrating screen 5 by a telescopic structure, and the adjustment of the gap may be achieved by balls having different sizes.

In addition, the clearance adjusting balls 7 can be arranged in three rows of upper, middle and lower along the axial direction of the magnetic roller 4, and the inner curved surface of the vibrating screen 5 is controlled to always keep a certain clearance with the magnetic roller 4.

In one possible embodiment of the present invention, the electrostatic grounding device is further included, and is used for introducing the electrostatic charges in the fine powder material adsorbed on the surface of the magnetic roller 4 to the ground, and conducting the electrostatic charges through the electrostatic grounding device to reduce the electrostatic charges, so as to break the electrostatic adsorption between the particles.

Further, the electrostatic grounding device comprises a carbon brush and a grounding wire, wherein one side of the carbon brush is connected with the magnetic roller 4 and is in close contact with the magnetic roller 4, so that static charges on the surface of the magnetic roller 4 can be effectively collected. The other side of the carbon brush is connected with the shell 1, so that the collected static charge can be conducted to the shell 1 through the carbon brush, and the grounding wire is welded with the shell 1 and is a metal wire with good conductivity and used for introducing the static charge on the shell 1 into the ground. The other end of the ground wire is connected to a ground means, such as a ground net, a ground pole, etc., to safely discharge the static charge into the ground.

In one possible embodiment of the invention, the vibrating screen 5 is connected with the driving piece 6 through a crankshaft, and the vibrating screen 5 is kept to vibrate horizontally and widely (0.6-2 cm) on the surface of the magnetic roller 4 under the power driving of the driving piece 6.

Specifically, the vibration amplitude of the vibration screen 5 is 0.6cm-2cm, and the vibration amplitude is the maximum displacement of the vibration screen 5 during operation, and determines the vibration intensity and impact force of the material on the screen surface. Too small amplitude may not fully disperse and delaminate the material to affect the sieving effect, and too large amplitude may cause excessive material jump, even damage the screen or cause material splash. Therefore, the selection of a suitable amplitude range is critical to achieving an efficient, stable screening process.

The clearance between the vibrating screen 5 and the magnetic roller 4 is 1 plus or minus 0.1mm. The size of this gap is important for ensuring a normal working distance between the two and preventing collision and wear. Too small a gap may cause contact between the two surfaces due to micro deformation of the surfaces of the magnetic drum or the inner curved surface of the vibrating screen 5, thereby generating friction and abrasion, and too large a gap may reduce the magnetic separation effect, because part of the magnetic material may not contact with the screen bars, and the magnetic agglomeration phenomenon may not be overcome, thereby not being effectively absorbed by the magnetic drum 4. Thus, by precisely controlling the size of this gap, efficient and stable operation of the vibrating screen 5 and the magnet drum 4 in the respective working areas can be ensured.

In one possible embodiment of the invention, the driving member 6 comprises a six-stage excitation motor with a vibration frequency of 1000 times/min, by means of which a sufficient vibration strength and sorting efficiency of the vibrating screen during operation can be ensured. Under the power drive of the exciting motor, the vibrating screen 5 is kept to do high-frequency (1000 times/min) horizontal wide-width (0.6-2 cm) motion on the surface of the magnetic roller 4.

In one possible embodiment of the present invention, the vibration screen further comprises a connecting piece 8, one end of the connecting piece 8 is connected with the casing 1 through a hook, and the other end of the connecting piece 8 is fixedly connected with the top of the vibration screen 5 through a screw, so that the vibration screen 5 can reciprocate along a preset track when driven by an exciting motor, and meanwhile, the relative position between the vibration screen and the casing 1 is kept stable. The connecting piece 8 plays a key bridge role in the integral structure, so that the vibrating screen 5 can be firmly mounted on the machine shell 1, and can be allowed to slide in a certain range so as to adapt to different working conditions and vibration requirements.

Specifically, the connecting piece 8 can adopt a basket wire rope locker, and the inner curved surface of the vibrating screen and the surface of the magnetic roller can be kept in an optimal fit state through manual adjustment.

In one possible embodiment of the invention, a plurality of clearance-adjusting balls 7 are uniformly distributed on the inner side of the vibrating screen 5. Since the vibrating screen 5 is vibrated and displaced to some extent during operation, the gap may be changed without an appropriate adjustment mechanism, thereby affecting the sorting effect. The clearance adjusting ball 7 can automatically adjust and maintain the clearance within a predetermined range by the rolling characteristic thereof, and ensure the stable operation of the equipment.

In one possible embodiment of the present invention, a permanent magnet 9 is further included for generating a magnetic field for the magnet drum 4, the vibrating screen 5 covers half of the surface area of the magnet drum 4, and the vibrating screen 5 is disposed corresponding to the permanent magnet 9. By arranging the vibrating screen 5 and the permanent magnet 9 in correspondence, it can be ensured that the magnetic field of the permanent magnet 9 can fully act on the magnetic particles in the material while the vibrating screen 5 stirs the material, so that the magnetic particles are more easily captured and separated. In the process of continuing to rotate the magnetic roller 4, the magnetic substances adsorbed on the magnetic roller 4 are far away from the magnetic field of the permanent magnet 9 and can fall down, so that the collection of products is realized.

In one possible embodiment of the invention, the vibrating screen further comprises a material distributing plate 10, a product hopper 11 and a tail hopper 12, wherein the material distributing plate 10 is arranged on the bottom side of the vibrating screen 5, the product hopper 11 is arranged on one side of the material distributing plate 10 away from the vibrating screen 5 and is used for receiving products, and the tail hopper 12 is arranged on one side of the material distributing plate 10 close to the vibrating screen 5 and is used for receiving waste materials. The purpose of the distributor plate 10 is to serve as a key component for material separation. After the materials are stirred by the vibrating screen 5 and magnetically separated by the magnetic roller 4, the materials fall onto the material separating plate 10 along a certain track. The material dividing plate 10 is scientifically arranged according to the separation rule of magnetic particles and non-magnetic particles in the materials, and guides the materials to different collecting areas.

The product hopper 11 is located on the side of the distributing plate 10 away from the vibrating screen 5 and is specially used for receiving the products meeting the requirements after magnetic separation. These products are generally materials with strong magnetism and acceptable quality.

A tail hopper 12 is provided on the side of the dividing plate 10 adjacent the vibrating screen 5 for receiving material that is undesirable or considered waste. Such waste materials may include non-magnetic materials and weakly magnetic materials. The design of the tail hopper ensures that the waste materials can be separated out rapidly and effectively, and avoids the pollution to the products and the waste of resources.

The dry magnetic separator provided by the invention takes grounding drainage as assistance to reduce static charge, high-frequency wide mechanical vibration as main function to destroy electrostatic adsorption force and generate micro magnetic force of particle agglomeration, materials fall into the vibrating screen 5 and are transversely pushed and stirred by dense vertical screen bars at high frequency, and horizontal reciprocating motion occurs for about 20-30 times in the 1-1.5 second motion process of the surface of the magnetic drum 4, so that the whole is in a boiling state, and the agglomeration phenomenon of fine powder is thoroughly eliminated. During the vertical rolling of the magnetic particles, the magnetic force in the magnetic receiving roller 4 continuously moves towards the surface of the magnetic roller 4, the occupation of non-magnetic or weak magnetic particles is extruded, the more the magnetic particles are formed on the surface of the magnetic roller, the adsorbed magnetic particles fall under the action of gravity when rotating to one side without a magnetic field area along with the rotation of the magnetic roller 4, and finally fall into the product hopper 11 in a discharging area. The non-magnetic and weak magnetic particles are forced to move outwards and fall into the tail hopper 12 under the action of gravity and centrifugal force, so that the aim of high-efficiency magnetic separation is successfully achieved.

In addition, the whole machine has lower manufacturing cost, can be modified on the existing common dry magnetic separator, can obtain a good magnetic separation effect, and can concentrate magnetic minerals by 3-6 times and has a recovery rate of more than 98 percent, so that the dry magnetic separation technology has a qualitative leap. All indexes (energy consumption, throughput, fu set coefficient, recovery rate, whole machine size, light weight and manufacturing cost) are greatly superior to those of the spiral dry magnetic separator with the best performance in the current market, and the spiral dry magnetic separator is in the leading position in the field of dry magnetic separation of fine powder and dry materials in China.

The single machine processing capacity can be adjusted and customized according to market demands, and the advantages are particularly obvious in large-scale dry magnetic separation production (> 500 tons/hour) of fine powder.

In describing embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected," "connected," and "coupled" should be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, or indirectly connected via an intermediate medium. The specific meaning of the above terms in the embodiments of the present invention will be understood by those of ordinary skill in the art according to specific circumstances.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "manner," "particular modes," or "some modes," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or mode is included in at least one embodiment or mode of the embodiments of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or manner. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or ways. Furthermore, various embodiments or modes and features of various embodiments or modes described in this specification can be combined and combined by those skilled in the art without mutual conflict.

It should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the technical solution described in the above-mentioned embodiments may be modified or some technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiments of the present invention.

Claims

1. A dry magnetic separator, comprising:

a feed inlet (2) is formed in the top of the shell (1);

The vibration feeding groove (3) is arranged in the shell (1), and the top of the vibration feeding groove (3) is arranged corresponding to the feeding hole (2);

the magnetic roller (4) is rotationally arranged in the shell (1), a part of magnetic field is arranged in the magnetic roller (4), and the magnetic field area is always kept unchanged in position relative to the shell;

The top of the vibrating screen (5) is hung on the shell (1), the vibrating screen (5) is positioned on the periphery of one side of the magnetic drum (4) with a magnetic field, and the top side of the vibrating screen (5) is arranged corresponding to the bottom side of the vibrating feed trough (3);

The driving piece (6) is connected with the vibrating screen (5), and the driving piece (6) is used for driving the vibrating screen (5) to reciprocate along the axial direction of the magnetic roller (4);

the gap adjusting balls (7) are arranged on one side, facing the magnetic roller (4), of the vibrating screen (5), and the gap adjusting balls (7) are in rolling contact with the magnetic roller (4) so that gaps are kept between the inner curved surface of the vibrating screen (5) and the magnetic roller (4).

2. The dry magnetic separator according to claim 1, further comprising electrostatic grounding means for introducing electrostatic charges in the fines adsorbed on the surface of the magnetic drum (4) to the ground.

3. The dry magnetic separator of claim 2, wherein the electrostatic grounding means comprises:

One side of the carbon brush is connected with the magnetic roller (4), and the other side of the carbon brush is connected with the shell (1);

And the grounding wire is connected with the shell in a welding way.

4. Dry magnetic separator according to claim 1, characterized in that the vibrating screen (5) is connected to the drive member (6) by means of a crankshaft.

5. The dry magnetic separator according to claim 1, further comprising a connecting piece (8), wherein one end of the connecting piece (8) is connected with the casing (1), and the other end of the connecting piece (8) is fixedly connected with the top of the vibrating screen (5) through screws.

6. The dry magnetic separator according to claim 1, wherein the vibration amplitude of the vibration screen (5) is 0.6cm-2cm, and the gap between the vibration screen (5) and the magnetic drum (4) is 1+ -0.1 mm.

7. Dry magnetic separator according to claim 1, characterized in that the driving member (6) comprises an excitation motor with a vibration frequency of 1000 times/min.

8. A dry magnetic separator as claimed in claim 1, characterized in that a plurality of said clearance-adjusting balls (7) are uniformly distributed inside said vibrating screen (5).

9. The dry magnetic separator according to claim 1, further comprising a permanent magnet (9) for generating a magnetic field for the magnetic drum (4), the vibrating screen (5) covering half of the surface area of the magnetic drum (4), and the vibrating screen (5) being disposed in correspondence with the permanent magnet (9).

10. The dry magnetic separator of claim 9, further comprising:

The material separating plate (10) is arranged at the bottom side of the vibrating screen (5);

The product hopper (11) is arranged on one side of the material separating plate (10) far away from the vibrating screen (5) and is used for receiving products;

the tail hopper (12) is arranged on one side of the material distributing plate (10) close to the vibrating screen (5) and is used for receiving waste materials.